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Recent studies of black holes in the nuclei of both active and normalgalaxies have yielded relationships that permit a physical interpretation ofthe principal components of the spectra of QSOs. It is shown that principalcomponent (or eigenvector) 1 (PC1) is driven predominantly by L/L{Edd}, andprincipal component 2 (PC2) is driven by luminosity or accretion rate. Thisresults in a PC2 vs. PC1 diagram in which lines of constant black hole mass arediagonal. Using a sample consisting of the low-redshift PG objects supplementedby 46 radio-loud QSOs, it is shown that such a diagram effectivelydistinguishes radio-loud from radio-quiet as well as demonstrating that bothnarrow-line Seyfert 1s and broad absorption-line QSOs (BALQSOs) lie at the highL/LEdd} extreme, though these two types of objects are well separated in thePC2 direction. The very few radio-loud BALQSOs known fall in the regionexpected to be populated by such objects. Finally, a simple picture that tiestogether physical parameters and classification of AGN is presented.Comment: 21 pages including 7 figures, accepted for publication in Ap.

Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio‐loud and Radio‐quiet QSOs